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How to type the notice that washing dishes is forbidden by the water cooler?

"Don't dirty the water you drink."

Please wash the dishes in a place where there is no drinking water.

"Please cherish the drinking water around you and wash dishes in places that are not drinking water."

"Please use water reasonably. This is drinking water. Please wash dishes in places that are not drinking water."

"Drop of water, why waste it? Please go to a place that is not drinking water to wash dishes. "